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"But if you no longer own it (so, if you sell the painting, so to speak), then you aren't."But that isn't IP. That's the creation of physical objects - and our understanding of it fairly nuanced and not very controversial. IP by definition cannot be "lost" by the creator, since it's about ideas and knowledge rather than their physical manifestations of said ideas.
A painter may "lose" a painting when they sell it, that's not the point under contention. The contention is, for example, if the painter should be compensated if the new owner replicates it and beings selling copies.
IP ownership cannot go by a "you no longer own it, it's fair game" state, because IP by definition cannot be meaningfully removed from one person and given to another.
See: music. I give you CD with my music on it - should I be compensated if you distribute copies of this music? Should I be compensated if you perform this composition on your own (i.e. a cover)? Who "owns" the music?